Mobile terminal and control method therefor

ABSTRACT

The present disclosure provides a mobile terminal capable of expanding a display unit, and a control method therefor. When an event occurs, the mobile terminal of the present disclosure provides a user with convenience by enabling the user to select whether to expand the display unit upon execution of the event. Specifically, the event can be the execution of a specific application or the reception of a notification related to a call or a message.

TECHNICAL FIELD

The present disclosure relates to a mobile terminal, and relates to a mobile terminal having a flexible display whose size is able to be changed and a method for controlling the same.

BACKGROUND ART

Terminals may be generally classified as mobile/portable terminals or stationary terminals according to their mobility. Mobile terminals may also be classified as handheld terminals or vehicle mounted terminals according to whether or not a user can directly carry the terminal.

A display device is a device having a function of receiving, processing, and displaying a video that a user may watch. For example, the display device receives a broadcast selected by the user from broadcast signals transmitted from a broadcasting station, separates a video signal from the received signals, and displays the separated video signal on a display.

In recent years, because of a development of a broadcasting technology and a network technology, functions of the display device have also been considerably diversified, and a performance of the device has been improved accordingly. That is, the display device has been developed to provide not only broadcast contents but also various other contents to the user. For example, the display device may provide game play, music listening, internet shopping, user customized information, and the like using various applications as well as programs received from the broadcasting station. In order to perform such extended functions, the display device may be basically connected to other devices or networks using various communication protocols, and may provide the user with an ubiquitous computing environment. In other words, the display device has evolved into a smart device that enables connectivity to a network and continuous computing.

In one example, recently, a flexible display capable of large deformation with sufficient elasticity has been developed. Such flexible display may be deformed to a degree of being able to be rolled. The mobile terminal may accommodate the rolled flexible display and may protrude the display from a body thereof to a desired size. Thus, the mobile terminal may have a more compact structure using the flexible display. In addition, as the mobile terminal includes such a rollable display, the mobile terminal may be referred to as a rollable mobile terminal.

In order to use such rollable mobile terminal, the display may be withdrawn from the body. Simultaneously with such withdrawal, the display may be extended to a size desired by a user.

When a call or a message is received during use of the mobile terminal, the user may expand a display of the mobile terminal before receiving the call or the message. In this case, the user may be inconvenienced by the need to perform two gestures, i.e. to expand the display and subsequently to select whether to receive the call or the message.

Therefore, there is a need for a new display-expanding method that minimizes the above problem and provides convenience to the user.

DISCLOSURE Technical Task

One purpose of an embodiment of the present disclosure is to provide a mobile terminal capable of extending a display and a method for controlling the same.

Another purpose of an embodiment of the present disclosure is to provide a mobile terminal that, when an event occurs, enables a user to select whether to expand a display upon execution of the event, thereby providing convenience to the user. Specifically, the event may be execution of a specific application or reception of a notification related to a call or a message.

Furthermore, another purpose of an embodiment of the present disclosure is to solve various problems not mentioned herein. Those skilled in the art may understand the spirit of the specification and the drawings.

Technical Solutions

In order to accomplish the above purposes, a mobile terminal includes a body having a variable size, a flexible display including a first display located on the front surface of the body and a second display located on the rear surface of the body, a driving unit configured to change the size of the body and the size of the first display, and a controller configured to control the driving unit to change the size of the body and the size of the first display. The flexible display including the first display and the second display has a constant total area such that, as the size of the first display increases, the size of the second display decreases, and the controller senses occurrence of an event, and performs control such that a function corresponding to the event is executed and the size of the first display is changed simultaneously therewith.

According to an embodiment, the event may include selection of a specific application in the mobile terminal by a user.

According to an embodiment, when the user selects the specific application, the controller may display, on the first display, a first selection menu enabling a determination as to whether to expand the first display, and the event may further include selection of one option from the first selection menu.

According to an embodiment, the size of the first display of the flexible display may be changed to one of a plurality of sizes. When the user selects the specific application, the controller may display, on the first display, a second selection menu enabling selection of one of the plurality of sizes, and the event may further include selection of one option from the second selection menu.

According to an embodiment, the event may include selection of a picture or a video in a social network service (SNS) application, and the controller may display the picture or the video only on an expansion area of the first display.

According to an embodiment, the controller may provide a menu enabling the user to set the specific application requiring expansion of the display.

According to an embodiment, the event may include reception of a notification related to a call or a message on the first display.

According to an embodiment, when the notification is received, the controller may display, on the first display, an option menu enabling a determination as to whether to expand the first display.

According to an embodiment, the size of the first display of the flexible display may be changed to one of a plurality of sizes. When the notification is displayed, the controller may display, on the first display, an option menu enabling selection of one of the plurality of sizes.

According to an embodiment, when the call is a video call, the controller may display, over the notification, a first option menu enabling a determination as to whether to expand the first display.

According to an embodiment, the first option menu may include an option of receiving a call only in an expansion area and an option of receiving a call over the entire area of the first display including the expansion area.

According to an embodiment, when the video call is received in the expanded state of the first display, the controller may display, on the first display, a second option menu including an option of disconnecting a call while contracting the expansion area and an option of disconnecting a call while maintaining the expansion area.

According to an embodiment, when the option of receiving a call only in the expansion area is selected, the controller may perform control such that the most recent task remains on the first display, other than the expansion area.

Advantageous Effects

According to an embodiment of the present disclosure, the mobile terminal capable of extending the display and the method for controlling the same may be provided.

Specifically, when an event occurs, the mobile terminal enables a user to select whether to expand the display upon execution of the event, thus eliminating the inconvenience whereby the user performs two gestures, i.e. a gesture of expanding the display and a subsequent gesture of executing the event. The event may be execution of a specific application or reception of a notification related to a call or a message.

Further, according to another embodiment of the present disclosure, there are additional technical effects not mentioned herein. Those skilled in the art may understand the spirit of the specification and the drawings.

DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram of a mobile terminal in accordance with the present disclosure.

FIG. 2 is an exploded perspective view of a mobile terminal according to one embodiment.

FIG. 3 shows perspective views respectively illustrating a first state and a second state viewed from one side of a mobile terminal according to one embodiment.

FIG. 4 shows rear face views respectively illustrating a first state and a second state of a mobile terminal according to one embodiment.

FIG. 5 shows cross-sectional views respectively taken along a line A-A and a line B-B of FIG. 3.

FIG. 6 is a flowchart showing a method of controlling a mobile terminal according to the present disclosure.

FIG. 7 illustrates concrete examples of occurrence of an event in the mobile terminal.

FIG. 8 is a diagram illustrating a selection menu displayed on a screen and expansion of a display of the mobile terminal related thereto when a specific application is executed.

FIG. 9 is a diagram illustrating a selection menu enabling selection of one of various expanded sizes of the display and expansion of the display of the mobile terminal related thereto when a specific application is executed.

FIG. 10 is a diagram illustrating expansion of the display of the mobile terminal when a social network service (SNS) application is executed and a picture or a video in the application is selected.

FIG. 11 is a diagram illustrating an option menu displayed on the screen and expansion of the display of the mobile terminal related thereto when a notification related to a message is received.

FIG. 12 is a diagram illustrating an option menu enabling selection of one of various expanded sizes of the display and expansion of the display of the mobile terminal related thereto when a notification is received.

FIG. 13 is a diagram illustrating an option menu displayed on the screen and expansion of the display of the mobile terminal related thereto when a notification related to a call is received.

FIG. 14 is a diagram illustrating an embodiment of receiving a video call when a notification related to the video call is received.

FIG. 15 is a diagram illustrating an option menu displayed on the screen and expansion of the display of the mobile terminal related thereto when a notification related to a video call is received.

FIG. 16 is a diagram illustrating an option menu displayed on the display and control of the display of the mobile terminal related thereto when the video call shown in FIG. 15 is received in the state in which the display is expanded.

FIG. 17 is a diagram illustrating an option menu displayed in a quick setting mode of the mobile terminal and expansion of the display of the mobile terminal related thereto.

BEST MODE FOR DISCLOSURE

Description will now be given in detail according to exemplary embodiments disclosed herein, with reference to the accompanying drawings. For the sake of brief description with reference to the drawings, the same or equivalent components may be provided with the same reference numbers, and description thereof will not be repeated. In general, a suffix such as “module” and “unit” may be used to refer to elements or components. Use of such a suffix herein is merely intended to facilitate description of the specification, and the suffix itself is not intended to give any special meaning or function. In the present disclosure, that which is well-known to one of ordinary skill in the relevant art has generally been omitted for the sake of brevity. The accompanying drawings are used to help easily understand various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings.

It will be understood that although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are generally only used to distinguish one element from another.

It will be understood that when an element is referred to as being “connected with” another element, the element can be directly connected with the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly connected with” another element, there are no intervening elements present.

The terminology used in the present disclosure is used only to describe specific embodiments, not intended to limit the present disclosure. A singular representation may include a plural representation unless it represents a definitely different meaning from the context.

Terms such as “include” or “has” are used herein and should be understood that they are intended to indicate an existence of several components, functions or steps, disclosed in the specification, and it is also understood that greater or fewer components, functions, or steps may likewise be utilized.

FIG. 1 is a block diagram of a mobile terminal in accordance with the present disclosure.

The mobile terminal 100 is shown having components such as a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, a controller 180, and a power supply unit 190. Referring now to FIG. 1, the mobile terminal 100 is shown having wireless communication unit 110 configured with several commonly implemented components. It is understood that implementing all of the illustrated components is not a requirement, and that greater or fewer components may alternatively be implemented.

More specifically, the wireless communication unit 110 typically includes one or more modules which permit communications such as wireless communications between the mobile terminal 100 and a wireless communication system, communications between the mobile terminal 100 and another mobile terminal, communications between the mobile terminal 100 and an external server. Further, the wireless communication unit 110 typically includes one or more modules which connect the mobile terminal 100 to one or more networks.

To facilitate such communications, the wireless communication unit 110 includes one or more of a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short-range communication module 114, and a location information module 115.

Regarding the wireless communication unit 110, the broadcast receiving module 111 is typically configured to receive a broadcast signal and/or broadcast associated information from an external broadcast managing entity via a broadcast channel. The broadcast channel may include a satellite channel, a terrestrial channel, or both. In some embodiments, two or more broadcast receiving modules 111 may be utilized to facilitate simultaneously receiving of two or more broadcast channels, or to support switching among broadcast channels.

The mobile communication module 112 can transmit and/or receive wireless signals to and from one or more network entities. Typical examples of a network entity include a base station, an external mobile terminal, a server, and the like. Such network entities form part of a mobile communication network, which is constructed according to technical standards or communication methods for mobile communications (for example, Global System for Mobile Communication (GSM), Code Division Multi Access (CDMA), CDMA2000 (Code Division Multi Access 2000), EV-DO (Enhanced Voice-Data Optimized or Enhanced Voice-Data Only), Wideband CDMA (WCDMA), High Speed Downlink Packet access (HSDPA), HSUPA (High Speed Uplink Packet Access), Long Term Evolution (LTE), LTE-A (Long Term Evolution-Advanced), and the like.

Examples of wireless signals transmitted and/or received via the mobile communication module 112 include audio call signals, video (telephony) call signals, or various formats of data to support communication of text and multimedia messages.

The wireless Internet module 113 is configured to facilitate wireless Internet access. This module may be internally or externally coupled to the mobile terminal 100. The wireless Internet module 113 may transmit and/or receive wireless signals via communication networks according to wireless Internet technologies.

Examples of such wireless Internet access include Wireless LAN (WLAN), Wireless Fidelity (Wi-Fi), Wi-Fi Direct, Digital Living Network Alliance (DLNA), Wireless Broadband (WiBro), Worldwide Interoperability for Microwave Access (WiMAX), High Speed Downlink Packet Access (HSDPA), HSUPA (High Speed Uplink Packet Access), Long Term Evolution (LTE), LTE-A (Long Term Evolution-Advanced), and the like. The wireless Internet module 113 may transmit/receive data according to one or more of such wireless Internet technologies, and other Internet technologies as well.

In some embodiments, when the wireless Internet access is implemented according to, for example, WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE, LTE-A and the like, as part of a mobile communication network, the wireless Internet module 113 performs such wireless Internet access. As such, the Internet module 113 may cooperate with, or function as, the mobile communication module 112.

The short-range communication module 114 is configured to facilitate short-range communications. Suitable technologies for implementing such short-range communications include BLUETOOTH™, Radio Frequency IDentification (RFID), Infrared Data Association (IrDA), Ultra-WideBand (UWB), ZigBee, Near Field Communication (NFC), Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, Wireless USB (Wireless Universal Serial Bus), and the like. The short-range communication module 114 in general supports wireless communications between the mobile terminal 100 and a wireless communication system, communications between the mobile terminal 100 and another mobile terminal 100, or communications between the mobile terminal and a network where another mobile terminal 100 (or an external server) is located, via wireless area networks. One example of the wireless area networks is a wireless personal area networks.

The location information module 115 is generally configured to detect, calculate, derive or otherwise identify a position of the mobile terminal. As an example, the location information module 115 includes a Global Position System (GPS) module, a Wi-Fi module, or both. If desired, the location information module 115 may alternatively or additionally function with any of the other modules of the wireless communication unit 110 to obtain data related to the position of the mobile terminal. As one example, when the mobile terminal uses a GPS module, a position of the mobile terminal may be acquired using a signal sent from a GPS satellite. As another example, when the mobile terminal uses the Wi-Fi module, a position of the mobile terminal can be acquired based on information related to a wireless access point (AP) which transmits or receives a wireless signal to or from the Wi-Fi module.

The input unit 120 includes a camera 121 for obtaining images or video, a microphone 122, which is one type of audio input device for inputting an audio signal, and a user input unit 123 (for example, a touch key, a push key, a mechanical key, a soft key, and the like) for allowing a user to input information. Data (for example, audio, video, image, and the like) is obtained by the input unit 120 and may be analyzed and processed by controller 180 according to device parameters, user commands, and combinations thereof.

Such cameras 121 may process image frames of still pictures or video obtained by image sensors in a video or image capture mode. The processed image frames can be displayed on the display unit 151 or stored in memory 170. In some cases, the cameras 121 may be arranged in a matrix configuration to permit a plurality of images having various angles or focal points to be input to the mobile terminal 100. As another example, the cameras 121 may be located in a stereoscopic arrangement to acquire left and right images for implementing a stereoscopic image.

The microphone 122 is generally implemented to permit audio input to the mobile terminal 100. The audio input can be processed in various manners according to a function being executed in the mobile terminal 100. If desired, the microphone 122 may include assorted noise removing algorithms to remove unwanted noise generated in the course of receiving the external audio.

The user input unit 123 is a component that permits input by a user. Such user input may enable the controller 180 to control operation of the mobile terminal 100. The user input unit 123 may include one or more of a mechanical input element (for example, a key, a button located on a front and/or rear surface or a side surface of the mobile terminal 100, a dome switch, a jog wheel, a jog switch, and the like), or a touch-sensitive input, among others. As one example, the touch-sensitive input may be a virtual key or a soft key, which is displayed on a touch screen through software processing, or a touch key which is located on the mobile terminal at a location that is other than the touch screen. On the other hand, the virtual key or the visual key may be displayed on the touch screen in various shapes, for example, graphic, text, icon, video, or a combination thereof.

The sensing unit 140 is typically implemented using one or more sensors configured to sense internal information of the mobile terminal, the surrounding environment of the mobile terminal, user information, and the like. For example, the sensing unit 140 may alternatively or additionally include other types of sensors or devices, such as a proximity sensor 141 and an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, a G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared (IR) sensor, a finger scan sensor, a ultrasonic sensor, an optical sensor (for example, camera 121), a microphone 122, a battery gauge, an environment sensor (for example, a barometer, a hygrometer, a thermometer, a radiation detection sensor, a thermal sensor, and a gas sensor, among others), and a chemical sensor (for example, an electronic nose, a health care sensor, a biometric sensor, and the like), to name a few. The mobile terminal 100 may be configured to utilize information obtained from sensing unit 140, and in particular, information obtained from one or more sensors of the sensing unit 140, and combinations thereof.

The output unit 150 is typically configured to output various types of information, such as audio, video, tactile output, and the like. The output unit 150 is shown having a display unit 151, an audio output module 152, a haptic module 153, and an optical output module 154. The display unit 151 may have an inter-layered structure or an integrated structure with a touch sensor in order to facilitate a touch screen. The touch screen may provide an output interface between the mobile terminal 100 and a user, as well as function as the user input unit 123 which provides an input interface between the mobile terminal 100 and the user.

The audio output module 152 is generally configured to output audio data. Such audio data may be obtained from any of a number of different sources, such that the audio data may be received from the wireless communication unit 110 or may have been stored in the memory 170. The audio data may be output during modes such as a signal reception mode, a call mode, a record mode, a voice recognition mode, a broadcast reception mode, and the like. The audio output module 152 can provide audible output related to a particular function (e.g., a call signal reception sound, a message reception sound, etc.) performed by the mobile terminal 100. The audio output module 152 may also be implemented as a receiver, a speaker, a buzzer, or the like.

A haptic module 153 can be configured to generate various tactile effects that a user feels, perceive, or otherwise experience. A typical example of a tactile effect generated by the haptic module 153 is vibration. The strength, pattern and the like of the vibration generated by the haptic module 153 can be controlled by user selection or setting by the controller. For example, the haptic module 153 may output different vibrations in a combining manner or a sequential manner.

An optical output module 154 can output a signal for indicating an event generation using light of a light source. Examples of events generated in the mobile terminal 100 may include message reception, call signal reception, a missed call, an alarm, a schedule notice, an email reception, information reception through an application, and the like.

The interface unit 160 serves as an interface with various types of external devices that can be coupled to the mobile terminal 100. The interface unit 160, for example, may include any of wired or wireless ports, external power supply ports, wired or wireless data ports, memory card ports, ports for connecting a device having an identification module, audio input/output (I/O) ports, video I/O ports, earphone ports, and the like. In some cases, the mobile terminal 100 may perform assorted control functions associated with a connected external device, in response to the external device being connected to the interface unit 160.

The memory 170 is typically implemented to store data to support various functions or features of the mobile terminal 100. For instance, the memory 170 may be configured to store application programs executed in the mobile terminal 100, data or instructions for operations of the mobile terminal 100, and the like. Some of these application programs may be downloaded from an external server via wireless communication. Other application programs may be installed within the mobile terminal 100 at time of manufacturing or shipping, which is typically the case for basic functions of the mobile terminal 100 (for example, receiving a call, placing a call, receiving a message, sending a message, and the like). It is common for application programs to be stored in the memory 170, installed in the mobile terminal 100, and executed by the controller 180 to perform an operation (or function) for the mobile terminal 100.

The controller 180 typically functions to control overall operation of the mobile terminal 100, in addition to the operations associated with the application programs. The controller 180 may provide or process information or functions appropriate for a user by processing signals, data, information and the like, which are input or output, or activating application programs stored in the memory 170.

To drive the application programs stored in the memory 170, the controller 180 may be implemented to control a predetermined number of the components mentioned above in reference with FIG. 1A. Moreover, the controller 180 may be implemented to combinedly operate two or more of the components provided in the mobile terminal 100 to drive the application programs.

The power supply unit 190 can be configured to receive external power or provide internal power in order to supply appropriate power required for operating elements and components included in the mobile terminal 100. The power supply unit 190 may include a battery, and the battery may be configured to be embedded in the terminal body, or configured to be detachable from the terminal body.

Some or more of the components may be operated cooperatively to embody an operation, control or a control method of the mobile terminal in accordance with embodiments of the present disclosure. Also, the operation, control or control method of the mobile terminal may be realized on the mobile terminal by driving of one or more application problems stored in the memory 170.

FIG. 2 is an exploded perspective view of a mobile terminal according to one embodiment. Further, FIG. 3 shows perspective views respectively illustrating a first state and a second state viewed from one side of a mobile terminal according to one embodiment. Further, FIG. 4 shows rear face views respectively illustrating a first state and a second state of a mobile terminal according to one embodiment. Further, FIG. 5 shows cross-sectional views respectively taken along a line A-A and a line B-B of FIG. 3. In these drawings, FIGS. 3 (a), 4 (a), and 5 (a) show a first state of the mobile terminal, and FIGS. 3 (b), 4 (b), and 5 (b) show a second state of the mobile terminal.

As shown, a mobile terminal 100 in a first state is contracted, and has a smaller size than the mobile terminal 100 in a second state. In addition, a size of a display unit 151 located disposed on a front face of the mobile terminal 100 also becomes smaller than that of the display unit 151 in the second state. The mobile terminal 100 of the first state is expanded in a first direction D1 to be in the second state. In the second state, the size of the mobile terminal 100 and a size of a front face of the display unit 151 are larger than those in the first state. In a following description, a direction in which the mobile terminal 100 and the display 151 thereof are extended or enlarged is referred to as a first direction D1, a direction in which the mobile terminal 100 and the display 151 thereof are contracted or retracted, or reduce to be converted into the first state from the second state is referred to as a second direction D2, and a direction perpendicular to the first and second directions D1 and D2 is referred to as a third direction.

The mobile terminal 100 of the present disclosure may be converted from the first state in which the display unit 151 is positioned on the front face of a bar-shaped mobile terminal as shown in FIG. 3 (a) into the second state as shown in FIG. 3 (b) by enlarging a screen thereof. In the second state, an area of the front face of the display unit 151 is enlarged, and an area of a rear face of the display unit 151 is reduced as shown in FIG. 4 (b). That is, the display unit 151 positioned on a rear face of the mobile terminal 151 in the first state moves to the front face of the mobile terminal 100 in the second state.

As such, the display unit may use a flexible display unit 151 that may be bent such that the position of the display unit may be varied. The flexible display is a lightweight, unbreakable, and durable display that is built on a thin and flexible substrate that may be bent, crooked, folded, twisted, or rolled while retaining properties of a conventional flat panel display.

In addition, an electronic paper is a display technology to which properties of general ink are applied. The electronic paper may be different from the conventional flat panel display in using reflected light. The electronic paper may change information using a twisted ball or electrophoresis using a capsule.

In a state in which the flexible display unit 151 is not deformed (e.g., a state of having an infinite curvature radius, hereinafter referred to as a basic state), a display region of the flexible display unit 151 becomes flat. In a state in which the flexible display unit 151 is deformed by an external force from the basic state (e.g., a state of having a finite radius of curvature, hereinafter referred to as a deformed state), the display region may become a curved face. As shown, information displayed in the deformation state may be visual information output on the curved face. Such visual information is implemented by independently controlling light emission of sub-pixels arranged in a matrix. The sub-pixel refers to a minimum unit for implementing one color.

The flexible display unit 151 may be in a curved state (e.g., a vertically or horizontally curved state) rather than a flat state in the basic state. In this case, when the external force is applied to the flexible display unit 151, the flexible display unit 151 may be deformed into the flat state (or a less curved state) or more curved state.

The flexible display unit 151 may be combined with a touch sensor to implement a flexible touch screen. When a touch is made on the flexible touch screen, the controller 180 (see FIG. 1) may perform control corresponding to such touch input. The flexible touch screen may be configured to detect the touch input in the deformed state as well as in the basic state.

The touch sensor detects the touch (or touch input) applied on the touch screen using at least one of various touch schemes such as a resistive film scheme, a capacitance scheme, an infrared scheme, an ultrasonic wave scheme, a magnetic field scheme, and the like.

As an example, the touch sensor may be configured to convert a change in pressure applied on a specific portion of the touch screen, capacitance generated at the specific portion, or the like into an electrical input signal. The touch sensor may be configured such that a touch object applying a touch on the touch screen may detect touched position and area on the touch sensor, a pressure during the touch, a capacitance during the touch, and the like.

Further, the mobile terminal 100 may have a deformation detection means for detecting the deformation of the flexible display unit 151. Such deformation detection means may be included in the sensing unit 140 (see FIG. 1).

The deformation detection means may be disposed in the flexible display unit 151 or a case (first to third frames 101 to 103 to be described later) to detect information related to the deformation of the flexible display unit 151. In this connection, the information related to the deformation may include a direction in which the flexible display unit 151 is deformed, a degree of the deformation, a deformed position, a deformed time, an acceleration at which the deformed flexible display unit 151 is restored, and the like. In addition, the information related to the deformation may be various information that may be detected due to the bending of the flexible display unit 151.

In addition, the controller 180 may change information displayed on the flexible display unit 151 or generate a control signal for controlling a function of the mobile terminal 100 based on the information related to the deformation of the flexible display unit 151 detected by the deformation detection means.

The state conversion (first or second state) of the flexible display unit 151, e.g., the size change at the front and rear faces of the mobile terminal 100 of the display unit 151 based on the size change of the mobile terminal 100 may be performed manually by a force applied by the user, but may be not limited to such manual scheme. For example, when the mobile terminal 100 or the flexible display unit 151 is in the first state, the mobile terminal 100 or the flexible display unit 151 may be converted into the second state by the user or an application command without the external force applied by the user. As such, in order for the flexible display unit 151 to be automatically deformed without the external force, the mobile terminal 100 may include a driving unit 200 to be described later.

The flexible display unit 151 of the present disclosure is bent 180 degrees while being rolled on one of both sides of the mobile terminal 100. Thus, a portion of the display unit 151 is disposed on the front face of the mobile terminal 100 based on such side, and the other portion thereof is disposed on the rear face of the mobile terminal 100. A portion of the display unit 151 located on the front face of the mobile terminal 100 may be fixed to the front face so as not to move. Further, the other portion thereof located on the rear face of the mobile terminal 100 may be movable to the rear face.

In addition, the display unit 151 may be rolled on or released from the side. Accordingly, the portion disposed on the rear face of the mobile terminal 100 moves, so that the size of the portion disposed on the front face of the mobile terminal 100 may be adjusted. Since the area of the flexible display unit 151 is determined and the flexible display unit 151 is formed of one continuous body, an area of the portion on the rear face decreases as an area of the portion on the front face increases. Such a display unit 151 may be rolled in a second frame 102, which is movable relative to a first frame 101 to be described later, more correctly, on one of sides of the second frame 102. The display unit 151 may be withdrawn or pulled out from or inserted or pushed into the second frame 102 while being rolled in the second frame 102 along a moving direction of the second frame 102 to adjust the area of the display unit 151 on the front face of the mobile terminal 100. Such operation will be described in more detail below along with other relevant components of the mobile terminal 100.

Typically, an antenna is disposed in the case or the housing of the mobile terminal 100, but a portion where the antenna is installed in the case or the housing may be limited because of the flexible display unit 151 that covers not only the front face of the mobile terminal 100 but also the rear face thereof. For this reason, the antenna may be implemented on the flexible display unit 151. An antenna on display (AOD) is an antenna in which a transparent film is formed by stacking an electrode layer and a dielectric layer that have patterns engraved thereon, respectively. The antenna on display may be implemented thinner than an antenna implemented using a laser direct structuring (LDS) technology using a conventional copper nickel plating scheme, so that the antenna on display may not be exposed to the outside without affecting a thickness. In addition, the antenna on display may transmit and receive a signal directly to or from the display unit 151. Accordingly, the antenna on display may be used in the mobile terminal 100 in which the display unit 151 is located on the both faces of the mobile terminal 100 as in the present disclosure.

With reference to FIGS. 2 to 5, a detailed configuration of the mobile terminal 100 of the present disclosure will be described in detail below. A following description will be achieved basically with reference to FIG. 2 illustrating an overall configuration. FIGS. 3 to 5 are referred to to explain detailed features of corresponding components in the first and second states of the mobile terminal 100.

The mobile terminal 100 of the present disclosure includes a main frame in which components are mounted, and the main frame of the present disclosure may vary in size in the first direction as shown in FIG. 2. One or more frames move relative to each other, and sizes thereof may vary in the first direction. Electronic components are mounted in the main frame, and the flexible display unit 151 is located out of the main frame.

Since the mobile terminal 100 of the present disclosure includes the flexible display unit, the flexible display unit 151 may be combined in a form surrounding a front face and a rear face of the main frame. The main frame may include first to third frames 101 to 103. The main frame may include the first frame 101, the second frame 102 moving in the first direction with respect to the first frame 101, and the third frame 103 moving in the first direction with respect to the second frame 102. The first frame 101 and the second frame 102 include front portions, a rear portions, and side portions, respectively, and are coupled to each other. Thus, the mobile terminal 100 may have a hexahedral outer shape by such coupled first and second frames 101 and 102. In consideration of an illustrated configuration of the first to third frames 101 to 103, movements of the second and third frames 102 and 103 may be a slide movement.

First, the first frame 101 corresponds to a main body of the mobile terminal 100, and may have a space therein for accommodating various components. In addition, the first frame 101 may accommodate the second frame 102 movably coupled to the first frame 101 in such a space. More specifically, as shown in FIGS. 2 and 5, the first frame 101 may include a first front portion 1011 disposed at a front portion of the mobile terminal 100 and a first rear portion 1012 and a second rear portion 1013 disposed at a rear portion of the mobile terminal.

Such first front portion 1011, first rear portion 1012, and second rear portion 1013 may be respectively formed of plate-shaped members that are generally flat. The first rear portion 1012 and the second rear portion 1013 may be respectively formed of separate members coupled to each other or may be formed of one member as shown. The first front portion 1011 and the first rear portion/second rear portion 1012 and 1013 may be spaced apart from each other at a predetermined spacing to define a predetermined space therebetween, and may be connected to each other by a side portion 1014. The controller 180 and the power supply unit 190 may be accommodated as components of the mobile terminal 100 in the space in the first frame 101. For example, the controller 180 may be a circuit board including a processor and an electronic circuit for controlling the operation of the mobile terminal, and the power supply unit 190 may be a battery and related components. In addition, the second frame 102 and the driving unit 200 to described later may also be accommodated in the first frame 101.

As described above, the display unit 151 has the continuous body, and thus, may be disposed on both the front face and the rear face of the mobile terminal 100 while being rolled in the mobile terminal 100. The display unit 151 may include the front face positioned at the front face of the mobile terminal 100, the rear face positioned at the rear face of the mobile terminal 100, and the side face positioned between the front face and the rear face thereof and surrounding the side face of the mobile terminal. The front face and the rear face of the display unit 151 are flat, and the side face of the display unit 151 may form a curved face. When the flexible display unit 151 may be damaged when being bent. Thus, the flexible display unit 151 may be formed to be bent with a predetermined curvature.

The display unit 151 may be divided into a fixed portion and a variable portion. The fixed portion means a portion fixed to the frame. Because of being fixed to the frame, the fixed portion maintains a constant shape without changing a bending degree. On the other hand, the variable portion means a portion in which a bending angle or a position of the bent portion changes. The variable portion in which the position or bending angle of the bent portion changes requires a structure for supporting a rear face of the variable portion in response to the change.

A first region of the display unit 151 may be coupled to the first front portion 1011 corresponding to the front face of the mobile terminal 100.

In one example, as shown in FIG. 4, various physical input units 120 for manipulation of the mobile terminal 100 and sensing units 140 may be located on the first rear portion 1012, and the display unit 151 may be disposed only on the second rear portion 1013. Since the first rear portion 1012 does not overlap the flexible display unit 151 regardless of the state of the mobile terminal, and is always exposed to the outside, the input unit 120 such as various buttons, switches, the camera 121, and a flash, and the sensing unit 140 such as a proximity sensor 141 may be arranged on the first rear portion 1012. In a conventional bar-shaped terminal, a display unit is provided only on a front face of the terminal. Therefore, a main camera is placed on a rear face of the terminal in order for the user to capture an object at an opposite side while looking through the display unit. On the other hand, an additional auxiliary camera is required to be disposed on the front face of the terminal in order for the user to capture himself or herself while viewing himself or herself through the display unit.

However, the display unit 151 is positioned both the front face and the rear face of the mobile terminal 100 of the present disclosure. Therefore, when the user captures himself or herself, a display unit on the same face as the camera 121, that is, the portion of the display 151 on the rear face of the mobile terminal 100 in the drawing may be used. Further, when the user captures the object on the opposite side of the user, a display unit on the opposite face of the camera 121, that is, the portion of the display unit 151 on the front face of the mobile terminal 100 in the drawing may be used. For this reason, the mobile terminal 100 may capture the object on the opposite side of the user and capture the user using the single camera 121. The camera may include a plurality of cameras having different angles of view, such as wide angle, super wide angle, and telephotographic cameras. In addition to the camera, a proximity sensor sound output unit may be positioned on the first rear portion 1012, and an antenna 116 may be installed on the first rear portion 1012.

The side portion 1014 may extend along edges of the first front portion 1011 and the first rear portion/second rear portion 1012 and 1013 to surround the first frame 101, and may form the outer shape of the mobile terminal 100. However, as mentioned above, since the second frame 102 is accommodated in the first frame 101 and is movably coupled thereto, in order to allow the movement of the second frame 102 relative to the first frame 101, a portion of the first frame 101 needs to be opened. As shown in FIG. 2, as an example, the second frame 102 is movably coupled to one of both side portions of the first frame 101, so that the side portion 1014 may not be formed on the same side portion, and thus, the portion of the first frame 101 may be opened. Accordingly, the first frame 101 may include a substantially closed first side portion 101 a and a second side portion 101 b, which is disposed to be opposite to the first side portion 101 a and is opened. The side portion 1014 is exposed to the outside of the mobile terminal 100, so that an interface unit 160 for connecting a supply port or an ear jack, the user input unit 120 such as a volume button, or the like may be disposed on the side portion 1014. When containing a metal material, the side portion 1014 may serve as an antenna.

The second rear portion 1013 of the first frame 101 may be covered by the display unit, but may be disposed on the front face of the display unit using a transparent material.

The second frame 102 may include a second front portion 1021 disposed at the front portion of the mobile terminal 100 and a third rear portion 1022 disposed at the rear portion of the mobile terminal 100. Like the first front portion 1011 and the first rear portion 1012 of the first frame 101, the second front portion 1021 and the third rear portion 1023 may be formed of plate-shaped members that are generally flat. In addition, the second frame 102 also accommodates various components, and should not interfere with the components accommodated in the first frame 101 during the movement. Accordingly, the second front portion 1021 and the third rear portion 1022 may be coupled to each other in a state of being spaced apart from each other to define a predetermined space therebetween, and may have shapes that do not interfere with the components in the first frame 101.

In addition, the display unit 151 may be bent 180 degrees while being rolled in the second frame 102 to be disposed on both the front face and the rear face of the mobile terminal 100. For such an arrangement of the display unit 151, the second frame 102 may include a roller 1028 rotatably disposed therein. The roller 1028 may be disposed at any position inside the second frame 102. However, the display unit 151 should be spread flat on the front face and the rear face of the mobile terminal 100 to provide a good quality screen to the user. Further, for such spread, a proper tension should be provided on the display unit 151. In order to provide the proper tension, the roller 1028 may be disposed at a first directional end of the second frame 102. The roller 1028 may extend in the third direction, and may be rotatably coupled to the second frame 102.

The display unit 151 may be rolled around the roller 1028 while being gently bent with a predetermined curvature. The flexible display unit 151 may include a first face on which a video is output and exposed to the outside and an inner face facing the frame at the opposite side. The roller 1028 may be installed to rotate freely in the second frame 102 while being in contact with the inner face of the display unit 151. Accordingly, the roller 1028 may actually move the display unit 151 in a lateral direction of the mobile terminal 100, that is, in a direction perpendicular to a longitudinal direction. As will be described later, when the second frame 102 slides, because of the tension applied by the second frame 102, the display unit 151 moves to the front face or the rear face of the mobile terminal 100 in different directions (e.g., the first direction D1 or the second direction D2) relative to the second frame 102. The roller 1028 may guide such movement while rotating.

In addition, the roller 1028 is disposed on a first side portion 102 a of the second frame 102, and the first side portion 102 a actually corresponds to an outermost side portion of the mobile terminal 100. When the first side portion 102 a of the second frame 102 is exposed, the display unit 151 rolled on the roller 1028 may be damaged. Accordingly, the second frame 102 may include a side frame 1024 disposed on the first side portion 102 a.

The side frame 1024 extends in the longitudinal direction of the second frame 102 to cover the first side portion 102 a, thereby protecting the roller 1028 and the display unit 151 rolled thereon. That is, the side frame 1024 covers the side face of the display unit 151, and the side face thereof is located in the third region. The first to third regions are at specified positions on the flexible display unit and do not change in size or position, but the sizes of the front face and the rear face, and the position of the side face are determined based on the state of the main frame.

The first region and the second region correspond to the fixed portion described above, and the third region corresponds to the variable portion described above.

The third region may vary in position depending on the state of the mobile terminal. Because the side face is rolled by the roller, the side face is bent with the predetermined curvature, and an inner face of the side frame may include a curved face corresponding to the curvature of the side face.

Because of the side frame 1024, the second frame 102 may have the substantially closed first side portion 102 a, and the side frame 1024 may substantially form the outer shape of the mobile terminal 100 together with the side face 1014 of the first frame 101. In addition, the second frame 102 may include a second side portion 102 b that is disposed opposite the first side portion 102 a to minimize interference with the components within the first frame 101 during the movement, and is opened.

Such a second frame 102 is movably coupled to the first frame 101, and thus may slide in the predetermined first or second direction D1 or D2 relative to the first frame 101. More specifically, the second frame 102 may be movably coupled to the first frame 101 through the side portion of the first frame 101, more precisely, through the opened second side portion 101 b, as shown. More specifically, the second side portion 102 b of the second frame is disposed relatively adjacent to the first side portion 101 a of the first frame 101 which is closed. Accordingly, the first side portion 102 a of the second frame may be disposed to be opposite to the first side portion 101 a. Accordingly, the second side portion 102 b is inserted into the first frame 101 through the side portion of the first frame, that is, the second side portion 101 b thereof. The first side portion 102 a is not inserted into the first frame 101 but is always located outside the first frame 101, thereby forming the outer shape of the mobile terminal 100 as described above. However, when necessary, such first side portion 102 b of the second frame 102 may also be inserted into the first frame 101.

Because of such positional relationship, the second frame 102 may extend from or contract to the first frame 101 in a direction perpendicular to the longitudinal direction of the mobile terminal 100 or the first frame 101. That is, the first and second directions D1 and D2 may basically be directions perpendicular to the longitudinal direction of the mobile terminal 100 or the first frame 101. Further, the first and second directions D1 and D2 may also be described as the lateral direction or the horizontal direction of the mobile terminal 100 or the first frame 101. In addition, during the movement in the first direction D1, the second frame 102 extends from the first frame 101. Accordingly, the first direction D1 may be a direction in which the second frame 102 moves away from the first frame 101, that is, moves outwardly of the mobile terminal 100 or the first frame 101. On the other hand, during the movement in the second direction D2, the second frame 102 contracts to the first frame 101. Thus, the second direction D2 is a direction opposite to the first direction D1, so that the second direction D2 may be a direction in which the second frame 102 moves to become closer to the first frame 101, that is, moves inwardly of the mobile terminal 100 or the first frame 101. When being moved in the first direction D1, such second frame 102 extends and applies a force to the portion of the display unit 151 disposed on the rear face of the mobile terminal 100, so that the portion of the display unit 151 may be disposed on the front face of the mobile terminal 100, and a region for such additional arrangement may be defined. Thus, the second frame 102 may convert the mobile terminal 100 into the second state with the display unit 151 with the relatively extended front face by moving in the first direction D1. On the other hand, when being moved in the second direction D2, the second frame 102 contracts into an original state thereof, and applies a force to the portion of the display unit 151 disposed on the front face of the mobile terminal 100 to return to the rear face of the mobile terminal 100 again. Thus, the second frame 102 may convert the mobile terminal 100 into the first state with the display unit 151 with the relatively contracted front face by moving in the second direction D2. Accordingly, the second frame 102 selectively exposes the display unit 151 to the front face of the mobile terminal 100 depending on the moving direction (e.g., the first or second direction D1 and D2). Accordingly, the mobile terminal 100 may be converted into the first or second state defined above.

During the expansion and the contraction in such first and second directions D1 and D2, the second frame 102 may overlap the first frame 101, more precisely, the first front portion 1011 and the first rear portion 1012 thereof so as not to interfere with the first frame 101. More specifically, the display unit 151 may be coupled to and supported by the first front portion 1011 of the first frame 101, as described above. Accordingly, the display unit 151 does not need to be additionally supported by the second front portion 1021 of the second frame 102. Rather, when the second front portion 1021 is interposed between the first front portion 1011 and the display unit 151, the display unit 151 may be deformed or damaged because of friction with the second front portion 1021, which is repeatedly moved. Thus, the second front portion 1021 may be disposed below the first front portion 1011, as shown in FIG. 5. That is, a front face of the second front portion 1021 may face the rear face of the first front portion 1011. In addition, the rear face of the first front portion 1011 may be in contact with the front face of the second front portion 1021 to stably support the movement of the second frame 102.

The third rear portion 1022 of the second frame 102 may be disposed below the second rear portion 1013 of the first frame 101. That is, the front face of the third rear portion 1022 may face the rear face of the second rear portion 1013. In addition, the rear face of the second rear portion 1013 may be in contact with the front face of the third rear portion 1022 to stably support the movement of the second frame 102. Because of such arrangement, the third rear portion 1022 may be exposed to the outside of the first frame, more precisely, of the second rear portion 1013, and may be coupled to the display unit 151.

Alternatively, when the second rear portion 1013 is made of a transparent material, the second rear portion 1013 may form an outer shape of the rear face of the mobile terminal. The second rear portion 1013 may be positioned rearward of the third rear portion 1022 of the second frame, and the flexible display unit may be disposed between the second rear portion 1013 and the third rear portion 1022 in the first state.

When the second rear portion 1013 is made of a material such as a transparent glass to form the outer shape of the rear face of the mobile terminal, the first rear portion 1012 may be implemented using the same member as the second rear portion 1013. That is, the camera 121, the flash or the sensing unit 140, and the like may be arranged by partially coating the plate-shaped member of the transparent glass material to not allow the internal components to be visible and by not coating only a required portion.

In addition, the second frame 102 may expand and contract the size of the mobile terminal 100 itself, particularly the front face of the mobile terminal 100 by the expansion and the contraction in the first and second directions D1 and D2. Thus, the display unit 151 should move by such extended or reduced front face size to obtain the intended first and second states. However, when being fixed to the second frame 102, the display unit 151 may not be moved smoothly to be adapted for the front face of the mobile terminal 100 that is expanded or contracted. For this reason, the display unit 151 may be movably coupled to the second frame 102. More specifically, the display unit 151 may include a first side edge (or side end) 151 d disposed on the front face of the mobile terminal 100 and a second side edge 151 e opposite to the first side edge 151 d and disposed on the rear face of the mobile terminal 100. The first side edge 151 may be disposed on the front face of the first frame 101, that is, the front face of the first front portion 1011 thereof, and may be disposed adjacent to the side portion of the mobile terminal 100, that is, the first side portion 101 a of the first frame. On the other hand, since the second side edge 151 e is adjacent to the rear face of the mobile terminal 100 and the third rear portion 1022 of the second frame 102, the second side edge 151 e may is be coupled the third rear portion 1022 of the second frame 102 to be movable in the first and second directions D1 and D2. In addition, since the display unit 151 is not structurally strong, a third frame 103 may be coupled to the second side edge 151 e. The third frame 103 may be formed of a plate-shaped member extending in the longitudinal direction of the mobile terminal 100. Accordingly, the third frame 103 may be coupled to the second frame, that is, the third rear portion 1022 thereof to be movable in the first and second directions D1 and D2 instead of the second side edge 151 e. In addition, the second frame 102 may include a slot 1025 extending in the lateral direction of the mobile terminal 100 or the second frame 102, that is, the direction perpendicular to the longitudinal direction thereof. Further, the third frame 103 may be stably moved while being guided by the slot 1025. The third frame 103 may include, for example, a projection inserted into the slot 1025 for the movement along the slot 1025.

Referring to FIGS. 3 to 5, in connection with such configuration of the first to third frames 101, 102, and 103, the display unit 151 may include a first region 1511 extending from one side thereof, that is, the first side edge 151 d toward the second side edge 151 e by a predetermined length, and a second region 1512 disposed opposite the first region 1511, and extending from the second side edge 151 e toward the first side edge 151 d by a predetermined length. In addition, the display unit 151 may include a third region 1513 disposed between the first and second regions 1511 and 1512. Such first to third regions 1511, 1512, and 1513 may be connected to each other, and may form a continuous body of the display unit 151. In addition, as described above, for the movement of the third region 1513 toward the front face or the rear face of the mobile terminal 100 depending on the moving direction of the second frame 102, the first region 1511 may be fixed so as not to move to the front face of the mobile terminal 100, and the second region 1512 may be provided to be movable on the rear face of the mobile terminal. Such configuration of the display unit 151 will be described in more detail below.

The first region 1511 may be disposed on the front face of the mobile terminal 100, more specifically, the first frame 101, that is, on the front face of the first front portion 1011. The first region 1511 is fixed to the first frame 101, that is, the front face of the first front portion 1011 so as not to be moved during the movement of the second frame 102, and thus, the first region 1511 may always be exposed to the front face of the mobile terminal 100. The third region 1513 may be adjacent to the first region 1511, and may extend into the second frame 102 and rolled on the roller 1028. The third region 1513 may consecutively extend out of the second frame 102 again and partially cover the second frame 102, that is, the rear face of the third rear portion 1022. Further, the second frame 102, that is, the third rear portion 1022, is adjacent to the first frame 101, that is, the second rear portion 1013 and together forms the rear case of the mobile terminal 100, so that it may be described that the third region 1513 is also disposed on the rear face of the first frame 101.

The second region 1512 may be adjacent to the third region 1513 and may be disposed on the rear face of the mobile terminal 100, more specifically, on the second frame, that is, the rear face of the third rear portion 1022 thereof. The second region 1512 may be coupled to the third frame 103 without being directly coupled to the second frame 102. As shown in FIG. 4 (b), the slot 1025 extending in the lateral direction (e.g, the direction perpendicular to the longitudinal direction of the mobile terminal 100) to the second frame 102, that is, to the third rear portion 1022 is defined. Further, the third frame 103 may move along the slot 1025. In FIG. 4 (b), it is shown that the slot 1025 is defined in the rear face of the second frame 102, but may be defined in the side face of the second frame 102. Although the second region 1512 may move in the first or second direction D1 or D2 with respect to the second frame 102 together with the third frame 103, the movement of the second region 1512 may be restricted within the rear face of the mobile terminal 100 by the slot 1025. That is, the second region 1512 does not move out of the second frame 102 even when the second frame 102 is extended or contracted, and may move along the slot 1025 within the second frame 102 by the extended or contracted distance of the second frame 102. Accordingly, the second region 1512 may always be exposed to the rear face of the mobile terminal 100.

As a result, the first region 1511 may be disposed on the front face of the mobile terminal 100 and may be always exposed to the front face regardless of the movement of the second frame 102, and the second region 1512 may be disposed on the rear face of the mobile terminal 100 and may be always exposed to the rear face regardless of the movement of the second frame 102. In addition, the third region 1513 may be disposed between the first and second regions 1511 and 1512, and may be selectively placed on the front face or the rear face of the mobile terminal 100 depending on the moving directions D1 and D2 of the second frame 102.

Because of such selective placement of the third region 1513, as shown in FIG. 4 (b), the second rear portion 1013 of the first frame 101 is covered by the second and third regions 1512 and 1513 and the third rear portion 1022 of the display unit 151 in the first state, but the third region 1513 moves to the front face of the mobile terminal 100 in the second state, and the third rear portion 1022 also moves in the first direction D1, so that the mobile terminal 100 may be exposed to the outside. In addition, the second front portion 1021 of the second frame 102 is disposed below the first front portion 1011 of the first frame 101 in the first state, but is moved out of the first frame 101 and supports the third region 1513 of the display unit 151 disposed on the front face of the mobile terminal 100 in the second state.

Since the first and second regions 1511 and 1512 are always respectively arranged on the front face and the rear face of the mobile terminal 100, curvatures of the first region 1511 and the second region 1512 do not change, and the first region 1511 and the second region 1512 may be maintained in a flat basic state. However, the third region 1513 may be rolled on the roller 1028 and bent in the second frame 102. When converting from the first state to the second state, the third region 1513 may extend from the second frame 102 to the front face of the mobile terminal 100 while being rolled on the roller 1028 in one direction. On the other hand, when converting from the second state to the first state, the third region 1513 may be retracted from the front face of the mobile terminal 100 to the second frame 102 while being rolled on the roller 1028 in the opposite direction, and at the same time, may return to the rear face of the mobile terminal 100 from the second frame 102. A specific location of the foldable mobile terminal in a form of being spread like a book is easily damaged because only the specific location is folded repeatedly. On the other hand, the deformed portion of the flexible display unit 151, that is, a portion rolled on the roller 1028, may vary based on the first and second states of the mobile terminal 100, that is, the movement of the second frame 102. Accordingly, the mobile terminal 100 of the present disclosure may significantly reduce deformation and fatigue repeatedly applied to a specific portion of the display unit 151, thereby preventing damage to the display unit 151.

Based on the above-described configuration, overall operations of the mobile terminal 100 will be described as follows. As an example, the state conversion may be performed manually by the user, and an operation of the mobile terminal 100 during such manual state conversion will be described. However, operations of the first to third frames 101 to 103 and the display unit 151, which will be described below, may be performed in the same manner when a power source other than a user's force is used, for example, when the driving unit 200 to be described below is applied.

As shown in FIGS. 3A, 4A, and 5A, the second frame 102 is fully retracted into the first frame 102 in the first state. Therefore, only the first region 1511 of the display unit 151 fixed to the front face of the first frame 101 may be exposed to the front face of the mobile terminal 100. Such first region 1511 may be fixed and supported to the first frame 101, that is, the first front portion 1011 thereof. In addition, a major portion of the third region 1513 may be disposed on the rear face of the mobile terminal 100 together with the second region 1512, and the third region 1513 may be disposed in the second frame 102 while being partially rolled on the roller 1028. The third region 1513 of the rear face of the mobile terminal 100 may be supported by the second frame, that is, the third rear portion 1022 thereof. The second region 1512 may be fixed by the third frame 103 disposed on the second frame (e.g., the third rear portion 1022) and may be movably coupled to the second frame 1012.

In such first state, when the second frame 102 moves in the first direction D1, the mobile terminal 100 may be converted into the second state. As shown in FIGS. 3B, 4B, and 5B, the second frame 102 may extend from the first frame 101 by the movement in the first direction D1, and may increase the overall size of the mobile terminal 100, in particular, the front face thereof. During the movement in the first direction D1, the second frame 102 may apply a force, that is, a tension, to the display unit 151 in the first direction D1. The display unit 151 is fixed to the first frame 101 but is coupled to the second frame 102 to be movable using the third frame 103, so that the force applied by the second frame 102 allows the third region 1513 to be rolled out from the roller 1028 of the second frame 102 to the front face of the mobile terminal 100. That is, the third region 1513 may be withdrawn (or pulled out) from the second frame 102 or extend to (or move out of) the second frame 102. At the same time, the third region 1513, particularly, the portion located on the rear face of the third region 1513 may be rolled into the roller 1028 of the second frame 102 from the rear face, or may be inserted (or pushed in), retracted, or moved into the second frame 102. Not an entirety of the third region 1513 is withdrawn from the second frame 102 to the front face of the mobile terminal 100, and a portion of the third region 1513 may be disposed in the second frame 102 while still being rolled on the roller 1028. In addition, for the smooth movement of the third region 1513, the second region 1512 may also move in the first direction D1 with respect to the second frame 102 together with the third frame 103. In addition, as described above, the second region 1512 and the third frame 103 may be constrained to the second frame 102 and move in the first direction D1 with respect to the first frame 101 together with the second frame 102. Accordingly, the second region 1512 and the third frame 103 may move in the first direction D1 relative to the first frame 101 as well as the second frame 102, and accordingly, move a distance longer than the moved distance of the second frame 102. Thus, because of such long distance movement in the first direction D1 of the second region 1512, the third region 1513 may be smoothly extended to the front face of the mobile terminal 100. Further, for the movement of the third region 1513, which is proportional to the expansion of the second frame 102, the movement of the second region 1512 and the third frame 103 in the first direction D1 may be performed simultaneously with the movement of such third region 1512 and second frame 102 in the first direction D1 to be proportional to the movement of third region 1513 and second frame 102.

When the second frame 102 is fully extended in the first direction D1, the first and third regions 1511 and 1513 may be arranged on the front face of the mobile terminal 100, and only the second region 1512 may be disposed on the rear face of the mobile terminal 100. Such first and third regions 1511 and 1513 may be supported by the first frame (e.g., the first front portion 1011 thereof) and the second frame (e.g., the second front portion 1021 thereof). In addition, the second frame 102, e.g., the third rear portion 1022 thereof exposes the second rear portion 1013 of the first frame while extending in the first direction D1, and supports the moving third region 1513. Therefore, in the second state, the mobile terminal 100 may have the extended front face display unit 151.

On the other hand, when the second frame 102 moves in the second direction D2 in the second state, the mobile terminal 100 may again return into the first state as shown in FIGS. 3A, 4A, and 5A. The second frame 102 may be contracted to the first frame 101 by the movement in the second direction D2, and may reduce the overall size of the mobile terminal 100, particularly the front face thereof. The movement of the display unit 151 during such movement of the second frame 102 may be performed in a reverse order of the movement in the first direction D1 described above. In brief, the third region 1513 may be rolled from the front face of the mobile terminal 100 into the roller 1028 of the second frame 102, or may be inserted, retracted, or moved into the second frame 102. At the same time, the third region 1513 may be rolled, withdrawn, extended, or moved out of the roller 1028 of the second frame 102 to the rear face of the mobile terminal 100. Not the entirety of the third region 1513 may be withdrawn from the second frame 102 to the rear face of the mobile terminal 100, and the portion of the third region 1513 may still be placed in the second frame 102 while still being rolled on the roller 1028. In addition, for such smooth movement of the third region 1513, the second region 1512 may also move in the second direction D2 with respect to the second frame 102 together with the third frame 103. The second region 1512 and the third frame 103 may be constrained to the second frame 102 to move in the second direction D2 with respect to the first frame 101 together with the second frame 102. Accordingly, the second region 1512 and the third frame 103 may move relatively in the second direction D2 with respect to not only the second frame 102 but also the first frame 101. As a result, the second region 1512 and the third frame 103 may move in the second direction D2 a distance larger than the moved distance of the second frame 102. Thus, because of such long distance movement of the second region 1512, the third region 1513 may be smoothly returned to the rear face of the mobile terminal 100. Further, for the movement of the third region 1513 proportional to the contraction of the second frame 102, the movements of the second region 1512 and the third frame 103 in the second direction D2 may be performed simultaneously with the movements of the third region 1512 and the second frame 102 in the second direction D2 to be proportional to the movements of the third region 1513 and the second frame 102. When the second frame 102 is completely contracted in the second direction D2, the mobile terminal 100 may be converted into the first state as described above, and may have the display unit 151 with the front face that is relatively reduced in comparison with the second state in the first state.

FIG. 6 is a flowchart showing a method of controlling a mobile terminal according to the present disclosure.

A mobile terminal of the present disclosure includes a body having a variable size, a flexible display including a first display located on the front surface of the body and a second display located on the rear surface of the body, a driving unit for changing the size of the body and the size of the first display, and a controller for controlling the driving unit to change the size of the body and the size of the first display. In addition, the total area of the flexible display including the first display and the second display is constant such that, as the size of the first display increases, the size of the second display decreases.

Therefore, as shown in FIG. 6, when an event occurs in the mobile terminal (S610), information on the occurrence of the event (S610) is transmitted to the controller. Thereafter, the controller performs an operation (S620), and transmits a generated control signal to the driving unit. More specifically, the controller may display, on the first display located on the front surface of the flexible display, a menu enabling a determination as to whether to change the size of the display. Thereafter, when the user selects to change the size of the display on the menu screen, a control signal for controlling the driving unit is generated. The driving unit operates in response to the control signal (S630), and accordingly, the size of the body and the screen of the flexible display are changed (S640).

FIG. 7 illustrates concrete examples of occurrence of an event in the mobile terminal.

The occurrence of an event (S610) may be broadly divided into two cases. The first case is execution of a specific application in the mobile terminal by the user (S611). Execution of the application (S611) may be divided into selection and execution of a preset specific application (S612) and selection and execution of a picture or a video in a social network service (SNS) application (S613).

Specifically, when the user selects a specific application, a menu enabling a determination as to whether to expand the display may be displayed in an area overlapping the specific application or on the first display located on the front surface. The menu screen may be displayed whenever any one of the applications is selected, but setting may be made such that the menu screen is displayed only for some of the applications. For example, when selecting a camera application, the user may take a photograph without increasing the default size of the mobile terminal, but it may be a desirable option for the user to be capable of taking a photograph using the mobile terminal with the display expanded. Therefore, when the user selects a camera application, if a menu enabling a determination as to whether to expand the display is automatically displayed, user convenience may be improved.

Further, when the user makes a video call, a menu enabling a determination as to whether to expand the display may also be provided. Accordingly, the user may make a video call to another user through the expanded display, and functions related to the video call, e.g. a speakerphone function, may be controlled to be automatically executed.

Further, setting may be made such that a menu enabling a determination as to whether to expand the display is also displayed for an application desired by the user. Therefore, the controller of the mobile terminal of the present disclosure may provide a menu enabling the user to select a desired application, for which expansion of the display is required.

The second case of occurrence of the event (S610) is reception of a notification by the mobile terminal (S615). The notification may be a notification related to reception of an incoming call (S616) or a notification related to reception of a message (S617).

When the notification is received by the mobile terminal, a menu enabling a determination as to whether to expand the screen may be displayed in an area overlapping the notification or on the first display located on the front surface.

FIG. 8 is a diagram illustrating a selection menu displayed on the screen and expansion of the display of the mobile terminal related thereto when a specific application is executed.

The application 361 selected by the user in FIG. 8 is a camera application. When the user clicks on the application 361, a first selection menu 371 enabling a determination as to whether to expand the first display 311 for the application 361 may be displayed on the first display 311 of the mobile terminal 300. When the user selects expansion of the display in the first selection menu 371, the mobile terminal 300 may execute the camera application while expanding the first display 311.

FIG. 9 is a diagram illustrating a selection menu enabling selection of one of various expanded sizes of the display and expansion of the display of the mobile terminal related thereto when a specific application is executed.

In the mobile terminal of the present disclosure, the display may be expanded to any one of a plurality of sizes. For example, as shown in FIG. 9(a), the first display 311 located on the front surface of the mobile terminal 300 of the present disclosure is capable of being expanded to two additional sizes.

The first display 311 includes a first fixed display 311 a having a default size and a first expansion display 311 b configured to be expandable from one side surface of the first fixed display 311 a.

Although the mobile terminal 300 is illustrated in FIG. 9(a) as having a total of three display sizes, including a default size and two expandable display sizes, the present disclosure is not limited thereto. For example, the three display sizes of the mobile terminal respectively correspond to horizontal to vertical ratios of 21:9, 16:9, and 4:3, but the phases of the size of the display may be changed or reset depending on the image quality or the type of image or content that is displayed on the mobile terminal.

In the case in which the display is expandable to a plurality of sizes, as shown in FIG. 9(b), when the user selects a specific application 361 on the first display 311 of the mobile terminal 300 of the present disclosure, a second selection menu 372 may be displayed. In addition, when the user selects a specific display size in the second selection menu 372, the size of the first display 311 of the mobile terminal 300 may be increased, and the selected specific application 361 may be executed.

FIG. 10 is a diagram illustrating expansion of the display of the mobile terminal when a social network service (SNS) application is executed and a picture or a video in the application is selected. A variety of SNS applications have recently been popularized, and accordingly, pictures or videos are shared between users through the applications. When the user checks a picture or the like in an SNS application through a conventional mobile terminal, the picture is displayed over the entire area of the display. In contrast, in the mobile terminal 300 of the present disclosure, the first display 311 is expandable, and thus the picture may be displayed only on the expansion area of the first display 311. For example, when the user selects a specific picture in the SNS application through the mobile terminal 300 of the present disclosure, a selection menu 373 enabling a determination as to whether to expand the display may be displayed in an area overlapping the picture or in an area peripheral to the picture. When the user clicks on the selection menu 373, the first display 311 may be expanded so as to be divided into the first fixed display 311 a and the first expansion display 311 b, and the user may observe the selected picture on the first expansion display 311 b. That is, the most recent screen of the SNS application remains on the screen of the first fixed display 311 a, and thus the user may perform multiple tasks simultaneously.

Meanwhile, although the SNS application is illustrated by way of example in FIG. 10, the present disclosure is not limited thereto. For example, setting may be made such that a selection menu related to expansion of the display is also displayed for camera and gallery applications, through which checking of pictures or videos is possible. Further, although it is illustrated in FIG. 10 that a picture or a video is displayed on the first expansion screen 311 b, the present disclosure is not limited thereto. For example, setting may be made such that the screen is expanded and a picture or a video is displayed over the entire area of the first display including the first fixed display 311 a and the first expansion display 311 b.

FIG. 11 is a diagram illustrating an option menu displayed on the screen and expansion of the display of the mobile terminal related thereto when a notification related to a message is received.

When a user is watching a video or playing a game using a general mobile terminal, if a notification related to a message is received, the user needs to stop watching the video or playing the game in order to check detailed information on the message.

In contrast, as shown in FIG. 11, when a notification 362 is received on the first display 311 of the mobile terminal 300 of the present disclosure, an option menu 374 enabling a determination as to whether to expand the display may be displayed in an area overlapping the notification 362 or in an area peripheral to the notification 362. When the user clicks on the option menu 374, as shown in FIG. 11(b), the first display 311 may be expanded so as to be divided into the first fixed display 311 a and the first expansion display 311 b, and the user may check information on the message on the first expansion display 311 b. However, the mobile terminal 300 of the present disclosure may be set such that the screen thereof is expanded and the information on the message is displayed over the entire area of the first display including the first fixed display 311 a and the first expansion display 311 b.

FIG. 12 is a diagram illustrating an option menu enabling selection of one of various expanded sizes of the display and expansion of the display of the mobile terminal related thereto when a notification is received.

In the case in which the display is expandable to a plurality of sizes, when a notification 362 is received on the first display 311 of the mobile terminal 300 of the present disclosure, an option menu 375 enabling selection of one of the plurality of sizes may be displayed on the first display 311. Further, when the user selects a specific display size in the option menu 375, the size of the first display 311 of the mobile terminal 300 may be increased, and thus the user may check detailed information on the notification 362.

FIG. 13 is a diagram illustrating an option menu displayed on the screen and expansion of the display of the mobile terminal related thereto when a notification related to a call is received.

When a notification 363 related to a call is received on the first display 311 located on the front surface of the mobile terminal 300, a first option menu 376 enabling a determination as to whether to expand the display may be displayed on the first display 311.

When the user selects expansion of the display in the option menu 376, the mobile terminal 300 may receive the call while expanding the first display 311. Specifically, the first display 311 may be expanded so as to be divided into the first fixed display 311 a and the first expansion display 311 b, and a call reception screen may be displayed on the first expansion display 311 b. In this case, the task that was being executed when the call was received may still be displayed on the first fixed display 311 a.

Further, as described above, the display of the mobile terminal 300 of the present disclosure is expandable to a plurality of sizes. Therefore, when a call is received in the state in which the display is expanded to a medium size, an option menu 377 enabling a determination as to whether to expand the display to a larger size may be displayed on the first expansion display 311 b. When the user selects expansion of the display in the option menu 377, the size of the first display of the mobile terminal 300 may be further increased, and the call reception screen may be displayed on the expanded display. In this way, the user is capable of selecting whether to expand the display even when a call is received, and thus convenience of using the mobile terminal may be improved.

Further, the first option menu 376 may include an option of receiving a call only in the expansion area and an option of receiving a call over the entire area of the first display including the expansion area.

FIG. 14 is a diagram illustrating an embodiment of receiving a video call when a notification related to the video call is received.

In the embodiment illustrated in FIG. 14, the display of the mobile terminal 300 of the present disclosure is not expanded. When a notification 363 related to a call is received, a determination may be made as to whether the call is a video call, and a video call screen may be displayed in a portion of the area of the first display 311. A separate window 364 as the video call screen may be located in a portion of the area of the first display 311, and the user may change the size of the window 364 to a desired size by dragging the edge of the window 364.

In a conventional mobile terminal, when a video call is received, a video call screen is displayed over the entire area of the display. In contrast, in the present disclosure, the user may check the video call screen through the separate window 364 in the first display 311.

FIG. 15 is a diagram illustrating an option menu displayed on the screen and expansion of the display of the mobile terminal related thereto when a notification related to a video call is received.

When a notification 363 related to a call is received on the first display 311, located on the front surface of the mobile terminal 300, a first option menu 365 enabling a determination as to whether to expand the display may be displayed on the notification 363. The first option menu 365 performs the same function as, but is displayed at a different position from, the first option menu 376 shown in FIG. 13.

When the user selects expansion of the display in the first option menu 365, the mobile terminal 300 may receive the video call while expanding the first display 311. Specifically, the first display 311 may be expanded so as to be divided into the first fixed display 311 a and the first expansion display 311 b, and a call reception screen may be displayed on the first expansion display 311 b.

Further, as described above, the mobile terminal 300 of the present disclosure is expandable to a plurality of sizes. Therefore, in the case in which the display is expandable to a plurality of sizes, when a notification related to a video call is received by the mobile terminal 300 of the present disclosure, an option menu enabling selection of one of the plurality of sizes may be displayed. Thereafter, the display may be expanded to the size selected by the user, and a video call screen may be displayed on the first expansion display 311 b.

Alternatively, the mobile terminal 300 of the present disclosure may be set such that the screen thereof is expanded and the video call screen is displayed over the entire area of the first display including the first fixed display 311 a and the first expansion display 311 b.

FIG. 16 is a diagram illustrating an option menu displayed on the display and control of the display of the mobile terminal related thereto when the video call shown in FIG. 15 is received in the state in which the display is expanded.

FIG. 16(a) illustrates the mobile terminal 300 in which a separate task is being executed on the first fixed display 311 a and a video call is received on the first expansion display 311 b. A second option menu 366, which includes an option of disconnecting a call while contracting the expansion area and an option of disconnecting a call while maintaining the expansion area, may be displayed on the first expansion display 311 b.

The user may select each option by performing a tap gesture or a swipe gesture on the second option menu 366.

In the case shown in FIG. 16(b), when the user performs a tap gesture on the second option menu 366, the first display 311 may be maintained in the expanded state, and the call may be terminated. Then, the call screen may be eliminated from the first expansion display, and the task that was being executed may still be displayed on the entire area of the first display 311 including the first expansion display.

Meanwhile, in the case shown in FIG. 16(c), when the user performs a swipe gesture on the second option menu 366, the first display 311, which has been expanded, may be contracted, and the call may be terminated. Further, as described above, since the size of the first display 311 of the mobile terminal 300 of the present disclosure is changeable to a plurality of sizes, the first display 311, which has been expanded, may be contracted to a plurality of sizes. Therefore, a menu screen may be displayed on the display so as to enable the user to select a desired size from among the plurality of sizes.

FIG. 17 is a diagram illustrating an option menu displayed in a quick setting mode of the mobile terminal and expansion of the display of the mobile terminal related thereto.

A general mobile terminal may have a quick setting mode. A user may quickly execute main functions of the mobile terminal, or may simply check a list of received notifications through the quick setting mode. As shown in FIG. 17, when the user checks a quick setting mode 367 on the first display 311 of the mobile terminal 300, an option menu 378 related to expansion of the display may be displayed over the received notification. When the user clicks on the option menu 378, the first display 311 may be expanded so as to be divided into the first fixed display 311 a and the first expansion display 311 b, and detailed information on the notification may be displayed on the first expansion display 311 b.

The description above is merely illustrative of the technical idea of the present disclosure, and various modifications and changes may be made by those skilled in the art without departing from the main characteristics of the present disclosure.

Therefore, the embodiments disclosed in the present disclosure are not intended to limit the technical idea of the present disclosure but to illustrate the present disclosure, and the scope of the technical idea of the present disclosure is not limited by the embodiments.

The scope of the present disclosure should be construed as being covered by the scope of the appended claims, and all technical ideas falling within the scope of the claims should be construed as being included in the scope of the present disclosure. 

1-13. (canceled)
 14. A mobile terminal, comprising: a body comprising a first frame structured to slideably engage a second frame to permit extending and retracting of the body by relative sliding motion between the first frame and the second frame; a flexible display comprising a first display portion located on a front side of the body and a second display portion located on a rear side of the body, wherein a size of the first display portion increases and a size of the second display portion decreases according to relative sliding motion between the first frame and the second frame in a first direction, and wherein the size of the first display portion decreases and the size of the second display portion increases according to relative sliding motion between the first frame and the second frame in a second direction; and a controller configured to: identify an occurrence of an event; and cause the relative sliding motion between the first frame and the second frame to change the size of the first display portion relative to the size of the second display portion.
 15. The mobile terminal of claim 14, wherein the event comprises selection of a specific application of the mobile terminal by a user.
 16. The mobile terminal of claim 15, wherein the controller is further configured to: cause the first display portion to display a first selection menu enabling a selection as to whether to expand the first display portion, based on user selection of the specific application, wherein the event further comprises selection of one option from the first selection menu.
 17. The mobile terminal of claim 15, wherein the size of the first display portion is changeable to one of a plurality of different sizes, and wherein the controller is further configured to cause the first display portion to display a second selection menu enabling selection of one of the plurality of sizes, and wherein the event further comprises selection of one option from the second selection menu.
 18. The mobile terminal of claim 16, wherein the event comprises selection of a picture or a video in a social network service (SNS) application, and wherein the controller is further configured to cause the flexible display to display the picture or the video only on an expansion area of the first display portion, wherein the expansion area is an area of the flexible display that was not located on the front side of the body prior to the occurrence of the event.
 19. The mobile terminal of claim 16, wherein the controller is further configured to cause the flexible display to display a menu enabling a user to set the specific application requiring expansion of the flexible display.
 20. The mobile terminal of claim 14, wherein the event comprises a notification related to a received call or a received message.
 21. The mobile terminal of claim 20, wherein the controller is further configured to: cause the first display portion to display an option menu enabling a selection as to whether to expand the first display portion, based on the notification.
 22. The mobile terminal of claim 7, wherein the size of the first display portion is changeable to one of a plurality of different sizes, and wherein the controller is further configured to: cause the first display portion to display an option menu enabling selection of one of the plurality of sizes, based on the notification.
 23. The mobile terminal of claim 20, wherein the controller is further configured to: cause the flexible display to display a first option menu enabling a selection as to whether to expand the first display portion, based on the call being a video call.
 24. The mobile terminal of claim 23, wherein the first option menu comprises an option of receiving a call only in an expansion area of the first display portion and an option of receiving a call over an entire area of the first display portion, including the expansion area.
 25. The mobile terminal of claim 24, wherein the controller is further configured to: cause the first display portion to display a second option menu comprising an option of disconnecting a call while reducing a size of the expansion area and an option of disconnecting a call while maintaining the size of the expansion area, based on the video call being received while the first display portion is in an expanded state.
 26. The mobile terminal of claim 24, wherein the controller is further configured to: cause the first display portion to display a most recent task at an area other than the expansion area, based on selection of the option of receiving a call only in the expansion area.
 27. The mobile terminal of claim 24, wherein the controller is further configured to perform a function corresponding to the event and simultaneously cause a change in the size of the first display portion.
 28. The mobile terminal of claim 24, further comprising: a driving unit configured to change a size of the body, and wherein the controller is further configured to: control the driving unit to cause the relative sliding motion between the first frame and the second frame to increase the size of the first display portion and decrease the size of the second display portion.
 29. A mobile terminal, comprising: a body comprising a first frame structured to slideably engage a second frame to permit manual extension and retraction of the body by relative sliding motion between the first frame and the second frame; a flexible display comprising a first display portion located on a front side of the body and a second display portion located on a rear side of the body, wherein a size of the first display portion increases and a size of the second display portion decreases according to relative sliding motion between the first frame and the second frame in a first direction, and wherein the size of the first display portion decreases and the size of the second display portion increases according to relative sliding motion between the first frame and the second frame in a second direction; and a controller configured to: cause the first display portion to display information associated with an application executing at the mobile terminal. 